I want to update the content type of a list item. When I try to send content type name or content type id as a normal Field, it throws the following exception.

A 'PrimitiveValue' node with non-null value was found when trying to read the value of a navigation property; however, a 'StartArray' node, a 'StartObject' node, or a 'PrimitiveValue' node with null value was expected

Please help me with this. Thanks in Advance!

  • What are you trying? Can you provide the code you are using?
    – wjervis
    Nov 22, 2016 at 13:20
  • Actually, I'm using my own form which has a Combobox, that passes the contentType ID. With that value, I wanted to update the list item. So in request stream of HTTPwebRequest I'm passing {'__metadata':{'type':'SP.Data.Jul4ListItem'},'Title':'test','try':'fddata', 'pplId':11,'ContentType':'0x01000D2F316B81461947BCF69E20750971AA'}} which has the Content Type ID. But without contentType id, it updates perfectly but with the base content type 'Item'. Nov 22, 2016 at 13:35
  • 1
    Have you tried this? "ContentTypeId": "0x01000D2F316B81461947BCF69E207509‌​71AA"
    – wjervis
    Nov 22, 2016 at 13:40
  • That's Wow. ya I'm passing ContentTypeId only right. It worked. Timely helped. Thanks:) Nov 22, 2016 at 13:47

1 Answer 1


Use ContentTypeId instead of ContentType:


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